package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberResponseVo;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.lang.reflect.Member;
import java.util.UUID;

/**
 * 在执行目标方法之前,判断用户的登录状态,并封装传递给controller目标请求
 */
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();
    /**
     * 目标方法执行之前
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberResponseVo memberResponseVo = (MemberResponseVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(memberResponseVo != null){
            //用户登录
            userInfoTo.setUserId(memberResponseVo.getId());
        }
        Cookie[] cookies = request.getCookies();
        if(cookies != null && cookies.length > 0){
            for (Cookie cookie: cookies) {
                //user-key
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    //标记为临时用户
                    userInfoTo.setTempUser(true);
                }
            }
        }
        //如果没有临时用户一定分配一个临时用户
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        //目标方法执行之前
        threadLocal.set(userInfoTo);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get(); //本地线程随意获取
        //如果没有临时用户一定保存一个临时用户
        //再次访问就不需要再创建了
        if(!userInfoTo.isTempUser()){ //当浏览器没有临时用户时执行请求之前创建一个uuid 并且默认值为false 请求第二次执行标志位为true不需要再进行创建
            //持续延长临时用户的过期时间
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME,userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
